Plastic puzzle ground mats may contain plasticizer, heavy metal and formamide contamination, resulting in endocrine-disrupting effects and carcinogenic risk due to the exposure. Bureau of Standards, Metrology and Inspection (BSMI) found that 37% of randomly purchased plastic puzzle ground mats samples did not meet formamide content requirements of the standard. Considering the harmful effects of plasticizer, heavy metal and formamide on children and human health, the BSMI intends to regulate the safety and quality requirements for plastic puzzle ground mats. The conformity assessment procedure is the Declaration of Conformity.